#include "usbd_core.h"
#include "usbd_cdc.h"

/*!< endpoint address */
#define CDC_IN_EP  0x81
#define CDC_OUT_EP 0x01
#define CDC_INT_EP 0x82

#define USBD_VID           0xFFFF
#define USBD_PID           0xFFFF
#define USBD_MAX_POWER     100
#define USBD_LANGID_STRING 1033

/*!< config descriptor size */
#define USB_CONFIG_SIZE (9 + CDC_ACM_DESCRIPTOR_LEN)

#ifdef CONFIG_USB_HS
#define CDC_MAX_MPS 512
#else
#define CDC_MAX_MPS 64
#endif

int32_t usb_timeout;

/*!< global descriptor */
static const uint8_t cdc_descriptor[] =
{
  USB_DEVICE_DESCRIPTOR_INIT(USB_2_0, 0xEF, 0x02, 0x01, USBD_VID, USBD_PID, 0x0100, 0x01),
  USB_CONFIG_DESCRIPTOR_INIT(USB_CONFIG_SIZE, 0x02, 0x01, USB_CONFIG_BUS_POWERED, USBD_MAX_POWER),
  CDC_ACM_DESCRIPTOR_INIT(0x00, CDC_INT_EP, CDC_OUT_EP, CDC_IN_EP, CDC_MAX_MPS, 0x02),
  ///////////////////////////////////////
  /// string0 descriptor
  ///////////////////////////////////////
  USB_LANGID_INIT(USBD_LANGID_STRING),
  ///////////////////////////////////////
  /// string1 descriptor
  ///////////////////////////////////////
  0x14,                       /* bLength */
  USB_DESCRIPTOR_TYPE_STRING, /* bDescriptorType */
  'C', 0x00,                  /* wcChar0 */
  'h', 0x00,                  /* wcChar1 */
  'e', 0x00,                  /* wcChar2 */
  'r', 0x00,                  /* wcChar3 */
  'r', 0x00,                  /* wcChar4 */
  'y', 0x00,                  /* wcChar5 */
  'U', 0x00,                  /* wcChar6 */
  'S', 0x00,                  /* wcChar7 */
  'B', 0x00,                  /* wcChar8 */
  ///////////////////////////////////////
  /// string2 descriptor
  ///////////////////////////////////////
  0x26,                       /* bLength */
  USB_DESCRIPTOR_TYPE_STRING, /* bDescriptorType */
  'C', 0x00,                  /* wcChar0 */
  'h', 0x00,                  /* wcChar1 */
  'e', 0x00,                  /* wcChar2 */
  'r', 0x00,                  /* wcChar3 */
  'r', 0x00,                  /* wcChar4 */
  'y', 0x00,                  /* wcChar5 */
  'U', 0x00,                  /* wcChar6 */
  'S', 0x00,                  /* wcChar7 */
  'B', 0x00,                  /* wcChar8 */
  ' ', 0x00,                  /* wcChar9 */
  'C', 0x00,                  /* wcChar10 */
  'D', 0x00,                  /* wcChar11 */
  'C', 0x00,                  /* wcChar12 */
  ' ', 0x00,                  /* wcChar13 */
  'D', 0x00,                  /* wcChar14 */
  'E', 0x00,                  /* wcChar15 */
  'M', 0x00,                  /* wcChar16 */
  'O', 0x00,                  /* wcChar17 */
  ///////////////////////////////////////
  /// string3 descriptor
  ///////////////////////////////////////
  0x16,                       /* bLength */
  USB_DESCRIPTOR_TYPE_STRING, /* bDescriptorType */
  '2', 0x00,                  /* wcChar0 */
  '0', 0x00,                  /* wcChar1 */
  '2', 0x00,                  /* wcChar2 */
  '2', 0x00,                  /* wcChar3 */
  '1', 0x00,                  /* wcChar4 */
  '2', 0x00,                  /* wcChar5 */
  '3', 0x00,                  /* wcChar6 */
  '4', 0x00,                  /* wcChar7 */
  '5', 0x00,                  /* wcChar8 */
  '6', 0x00,                  /* wcChar9 */
#ifdef CONFIG_USB_HS
  ///////////////////////////////////////
  /// device qualifier descriptor
  ///////////////////////////////////////
  0x0a,
  USB_DESCRIPTOR_TYPE_DEVICE_QUALIFIER,
  0x00,
  0x02,
  0x02,
  0x02,
  0x01,
  0x40,
  0x01,
  0x00,
#endif
  0x00
};

USB_NOCACHE_RAM_SECTION USB_MEM_ALIGNX uint8_t read_buffer[2048];
USB_NOCACHE_RAM_SECTION USB_MEM_ALIGNX uint8_t write_buffer[2048];

volatile bool ep_tx_busy_flag = false;

struct cdc_line_coding curr_line_coding;

#ifdef CONFIG_USB_HS
#define CDC_MAX_MPS 512
#else
#define CDC_MAX_MPS 64
#endif

void usbd_event_handler(uint8_t event)
{
  switch(event)
  {
  case USBD_EVENT_RESET:
    break;
  case USBD_EVENT_CONNECTED:
    break;
  case USBD_EVENT_DISCONNECTED:
    break;
  case USBD_EVENT_RESUME:
    break;
  case USBD_EVENT_SUSPEND:
    break;
  case USBD_EVENT_CONFIGURED:
    /* setup first out ep read transfer */
    usbd_ep_start_read(CDC_OUT_EP, read_buffer, 2048);
    break;
  case USBD_EVENT_SET_REMOTE_WAKEUP:
    break;
  case USBD_EVENT_CLR_REMOTE_WAKEUP:
    break;

  default:
    break;
  }
}

void usbd_cdc_acm_set_line_coding(uint8_t intf, struct cdc_line_coding *line_coding)
{
  memcpy(&curr_line_coding, line_coding, sizeof(struct cdc_line_coding));
}

__WEAK void usbd_cdc_acm_get_line_coding(uint8_t intf, struct cdc_line_coding *line_coding)
{
  memcpy(line_coding, &curr_line_coding, sizeof(struct cdc_line_coding));
}

void usbd_cdc_acm_bulk_out(uint8_t ep, uint32_t nbytes)
{
  USB_LOG_RAW("actual out len:%d\r\n", nbytes);
  for(int i = 0; i < nbytes; i++)
  {
    printf("%02x ", read_buffer[i]);
  }
  printf("\r\n");

  ep_tx_busy_flag = true;
  usb_timeout = 50;
  uint8_t result = usbd_ep_start_write(CDC_IN_EP, read_buffer, nbytes);
  while(ep_tx_busy_flag && result == 0 && usb_timeout > 0)
  {
    usb_timeout--;
  }

  /* setup next out ep read transfer */
  usbd_ep_start_read(CDC_OUT_EP, read_buffer, 2048);
}

void usbd_cdc_acm_bulk_in(uint8_t ep, uint32_t nbytes)
{
  USB_LOG_RAW("actual in len:%d\r\n", nbytes);

  if((nbytes % CDC_MAX_MPS) == 0 && nbytes)
  {
    /* send zlp */
    usbd_ep_start_write(CDC_IN_EP, NULL, 0);
  }
  else
  {
    ep_tx_busy_flag = false;
  }
}

/*!< endpoint call back */
struct usbd_endpoint cdc_out_ep =
{
  .ep_addr = CDC_OUT_EP,
  .ep_cb = usbd_cdc_acm_bulk_out
};

struct usbd_endpoint cdc_in_ep =
{
  .ep_addr = CDC_IN_EP,
  .ep_cb = usbd_cdc_acm_bulk_in
};

struct usbd_interface intf0;
struct usbd_interface intf1;

void cdc_acm_init(void)
{
  const uint8_t data[10] = { 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x30 };

  memcpy(&write_buffer[0], data, 10);
  memset(&write_buffer[10], 'a', 2038);

  usbd_desc_register(cdc_descriptor);
  usbd_add_interface(usbd_cdc_acm_init_intf(&intf0));
  usbd_add_interface(usbd_cdc_acm_init_intf(&intf1));
  usbd_add_endpoint(&cdc_out_ep);
  usbd_add_endpoint(&cdc_in_ep);
  usbd_initialize();
}

volatile uint8_t dtr_enable = 0;

void usbd_cdc_acm_set_dtr(uint8_t intf, bool dtr)
{
  if(dtr)
  {
    dtr_enable = 1;
  }
  else
  {
    dtr_enable = 0;
  }
}

void cdc_acm_data_send_with_dtr_test(void)
{
  if(dtr_enable)
  {
    ep_tx_busy_flag = true;
    usbd_ep_start_write(CDC_IN_EP, write_buffer, 2048);
    while(ep_tx_busy_flag)
    {
    }
  }
}